Ryanair boss Michael O'Leary has dismissed concerns about security at Dublin Airport, saying it's among the best in the world.

Mr O'Leary also said that the coverage of the alleged immigration scam in the airport was a "storm in a teacup".

"I believe the immigration controls at Dublin Airport, and the security at Dublin Airport, are excellent by any international standards," he said.

"They are among the best in Europe and among the best in the world.

"But there is no system that will prevent (alleged) collusion (in relation to trafficking)."

Mr O'Leary also said that gardaí had overblown the arrests in relation to the alleged illegal immigration network at Aer Lingus.

"As we know, as much as I love the Garda Síochána, there's no better men to blow up their involvement," Mr O'Leary added. "The unfortunate thing is that the gardaí - who deserve significant praise for identifying this (alleged human trafficking scam) - tend at their weekly briefings to overplay it."

The budget airline CEO also defended a tweet published by Ryanair on Monday evening that showed a mock-up of a person sandwiched into an Aer Lingus catering box. It was labelled 'Immigrants Flies (sic) Aer Lingus', in a pop at its smaller rival's tagline, 'Smart flies Aer Lingus'.

Mr O'Leary joked that he may even give his social media team a raise as a result of the coverage.

"I didn't think they were particularly funny last night when they went out," he said of the Ryanair tweet.

"But I must say I am highly enthused by the reaction and response they've got. I intend to give our social media team a 'well done' note and probably a pay rise for generating an unusual amount of free publicity for Ryanair."

The airline CEO said he can be "absolutely certain" that such an alleged illegal human trafficking scam could not operate at Ryanair.